ARM: samsung: Use devm_platform_ioremap_resource() to simplify code

Use devm_platform_ioremap_resource() instead of
platform_get_resource() + devm_ioremap_resource().

Signed-off-by: Shengju Zhang <zhangshengju@cmss.chinamobile.com>
Signed-off-by: Tang Bin <tangbin@cmss.chinamobile.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>